percpu: Remove irqsafe_cpu_xxx variants

We simply say that regular this_cpu use must be safe regardless of
preemption and interrupt state.  That has no material change for x86
and s390 implementations of this_cpu operations.  However, arches that
do not provide their own implementation for this_cpu operations will
now get code generated that disables interrupts instead of preemption.

-tj: This is part of on-going percpu API cleanup.  For detailed
     discussion of the subject, please refer to the following thread.

     http://thread.gmane.org/gmane.linux.kernel/1222078

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
LKML-Reference: <alpine.DEB.2.00.1112221154380.11787@router.home>

include/linux/netfilter/x_tables.h

@@ -471,7 +471,7 @@ DECLARE_PER_CPU(seqcount_t, xt_recseq);
  *
  * Begin packet processing : all readers must wait the end
  * 1) Must be called with preemption disabled
- * 2) softirqs must be disabled too (or we should use irqsafe_cpu_add())
+ * 2) softirqs must be disabled too (or we should use this_cpu_add())
  * Returns :
  *  1 if no recursion on this cpu
  *  0 if recursion detected
@@ -503,7 +503,7 @@ static inline unsigned int xt_write_recseq_begin(void)
  *
  * End packet processing : all readers can proceed
  * 1) Must be called with preemption disabled
- * 2) softirqs must be disabled too (or we should use irqsafe_cpu_add())
+ * 2) softirqs must be disabled too (or we should use this_cpu_add())
  */
 static inline void xt_write_recseq_end(unsigned int addend)
 {